Internal Combustion Engines
In compression ignition engines, swirl denotes a

None of the listed here
Rotary motion of the gases in the chamber
Radial motion of the gases in the chamber
Haphazard motion of the gases in the chamber

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens at bottom dead center and closes at top dead center
Exhaust valve opens just after bottom dead center and closes just before top dead center
May open and close anywhere

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